4
LTC1967
1967f
ELECTRICAL CHARACTERISTICS
Note 13: The common mode rejection ratios of the LTC1967 are measured
with DC inputs from 50mV to 350mV. The input CMRR is defined as the
change in V
IOS
measured between input levels of 0V to 350mV and input
levels of V
+
– 350mV to V
+
divided by V
+
– 350mV. The output CMRR is
defined as the change in V
OOS
measured with OUT RTN = 0V and OUT RTN
= V
+
– 350mV divided by V
+
– 350mV.
Note 14: The LTC1967 input and output voltage swings are limited by
internal clipping. However, its ∆Σ topology is relatively tolerant of
momentary internal clipping.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Gain and Offset
vs Output Common Mode Voltage
Gain and Offset
vs Input Common Mode Voltage
Note 15: The LTC1967 exploits oversampling and noise shaping to reduce
the quantization noise of internal 1-bit analog-to-digital conversions. At
higher input frequencies, increasingly large portions of this noise are
aliased down to DC. Because the noise is shifted in frequency, it becomes
a low frequency rumble and is only filtered at the expense of increasingly
long settling times. The LTC1967 is inherently wideband, but the output
accuracy is degraded by this aliased noise.
INPUT COMMON MODE VOLTAGE (V)
0
–0.7
GAIN ERROR (%)
OFFSET VOLTAGE (mV)
–0.6
–0.4
–0.3
–0.2
0.3
0
1.0
2.0
2.5 5.04.5
1967 G01
–0.5
0.1
0.2
–0.1
–1.0
–0.8
–0.4
–0.2
0
1.0
0.4
–0.6
0.6
0.8
0.2
0.5
50mV ≤ V
IN(PEAK)
≤ 350mV
1.5
3.0
3.5
4.0
V
IOS
V
OOS
GAIN ERROR
OUTPUT COMMON MODE VOLTAGE (V)
0
–0.5
GAIN ERROR (%)
OFFSET VOLTAGE (mV)
–0.4
–0.2
–0.1
0
0.5
0.2
1.0
2.0
2.5 5.04.5
1967 G02
–0.3
0.3
0.4
0.1
–1.0
–0.8
–0.4
–0.2
0
1.0
0.4
–0.6
0.6
0.8
0.2
0.5 1.5
3.0
3.5
4.0
V
IOS
V
OOS
GAIN ERROR
50mV ≤ V
IN(PEAK)
≤ 350mV
Gain and Offsets vs Temperature
Gain and Offset vs Supply Voltage
TEMPERATURE (°C)
–40
GAIN ERROR (%)
OFFSET VOLTAGE (mV)
0.01
0.03
0.05
V
OOS
60
1967 G03
–0.01
–0.03
0
0.02
0.04
–0.02
–0.04
–0.05
0.1
0
0.3
0.5
–0.1
–0.3
0.2
0.4
–0.2
–0.4
–0.5
–15
10
35
85
V
IOS
GAIN ERROR
50mV ≤ V
IN(PEAK)
≤ 350mV
SUPPLY VOLTAGE (V)
4.5
–0.5
GAIN ERROR (%)
OFFSET VOLTAGE (mV)
–0.4
–0.2
–0.1
0
0.5
0.2
4.8
5.1
6.0
1967 G04
–0.3
0.3
0.4
0.1
–1.0
–0.8
–0.4
–0.2
0
1.0
0.4
–0.6
0.6
0.8
0.2
5.4
5.7
V
IOS
V
OOS
GAIN ERROR
50mV ≤ V
IN(PEAK)
≤ 350mV
